With a new three-phase configuration (MultiPlus 3000), this error message regularly appears and then keeps coming back.
There are also periods of several weeks when this error does not occur.
The DC voltage then jumps from 45.80 to 53.22 V. The DC multimeter only shows the higher voltage…
The battery is equipped with a JK BMS and connected via CAN bus; the values are read and displayed correctly.
What could be causing this?
Hello,
do you have anything connected to the voltage sense inputs of the inverters?
If not, then it may be possible to eliminate this error by connecting the V-sense inputs to the battery bus bars via a 2A fuse.
Only the Cerbo, is it possible to post images?
Pardon, but this is not clear…
Each of the 3 inverters have voltage sense terminals.
The Cerbo should be powered direct from the Bus.
If you have the upload link in the message editor box, then you can upload images.. look for the up arrow with line underneath.
OK, so there are no connections to the Volt sense inputs of the inverters:
They would be thin wires connected to one end of the green terminal block, see the multiplus manual for details.
This error should not be happening, was this installed for you?
No, the third system as well—the Volt sense inputs aren’t connected on the other systems either.
OK, so first is to check all the DC connections are tight.
you may be able to see which of the inverters is causing the error.
It might be good also to check the DC voltage on the V-sense inputs of the inverters with a voltmeter - while the error is active.
I have checked the DC connections several times. I can’t see remotely which Multi is causing this error. The multimeter shows a stable voltage on the busbar.
I’ve checked that, but I can’t find a cause for the highly fluctuating voltage shown in the graph.
There’s a 300A JK BMS installed, and the total battery capacity is 628Ah.
I’m going to go over the entire system again this afternoon, tighten the bolts, etc., although in the meantime the problem has also ‘spontaneously’ disappeared again.
I’m thinking it may be a measurement error on one of the Multis…..
And where is the “Battery monitor”?
Op de JK BMS
So the values from the JKBMS come through via the CAN bus.
Did you make the cable yourself, and is there a terminator at the Cerbo end? (In the event of a communication error, I would expect an error message.)
No, I ordered it that way from Victron; it was plug-and-play and worked straight away. Type A cable.
Problem found: it turned out to be excessive contact resistance in a 3-pole DC switch in the battery enclosure.
The multimeter showed 53 V on the primary side and 42 V on the secondary side. I bypassed the switch and it worked straight away.
Thanks for thinking along!
